Word problems questions: How much energy (kJ) is needed to accelerate an 1800 kg

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Word problems questions:

How much energy (kJ) is needed to accelerate an 1800 kg vehicle from 10 km/h to 30 km/h? Assume that the electron takes place over a 10 second time period, on level ground, and that you can neglect aerodynamic drag and tire Friction. Also calculate How much power is needed. Consider a 1500 kg vehicle traveling at some unknown velocity and suddenly the brakes are applied and the vehicle is brought to a stop. Assume that the braking takes place over a 15 second time period, on level ground, and that you can neglect aerodynamic drag and tire friction. The amount of energy required to bring the vehicle to a stop is 600 kJ. Can you calculate the speed at which the braking began in km/hr. Consider the Hoover Dam hydro-electric plant located in Arizona and Nevada. II the average lake level is 160 m above the turbine outlet, determine the minimum mass flow rate of water through the 17 turbines if the total power produced from all tour turbines is 2080 MW. What is the mass flow rate if the turbines are 88% efficient?

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